Workgroups

The initial focus for simplifying potential risk assessment of chemical
mixtures will be on freshwater streams and rivers, as most municipal and
industrial waste discharges affect these environs and they are receptors for
other diffuse sources of chemicals. Simplification will be based on typical
exposure scenarios that link the source(s) of chemical mixtures with potential
responses in the environment. The major chemical/discharge scenarios envisioned
are Domestic wastewater, Urban discharge and Agricultural discharge. Each exposure scenario workgroup
(WG) will be asked to consider a set of “big-picture” generic questions (the
same for each WG) and a set of more specific questions related to each
scenario.

Urban discharge: Urban environment emissions such as from roads and
buildings associated with metals, fuel combustion products, those emanating
from vehicle and tire wear and those incorporated in settled particulates from
the atmosphere;

Next to the three exposure scenario WG’s, the Integrating WG will draft
a cross-cutting framework that brings the three exposure scenario WG’s and
their documents together. The group will define the communalities between the 3
WG’s and assemble a framework decision tree to simplify the issue. Read more...